Phase three of Visible Ops is Create a Repeatable Build Library. This phase’s focus is to define build mechanisms, create system images, and establish documentation that together describe how to build our desired infrastructure from “bare metal” (I’ll continue to use “bare metal” throughout for consistency, but “bare VM” may be more appropriate in today’s virtualized IT). This allows us to treat our infrastructure like fuses. When a fuse pops, it is discarded instead of repaired and a new fuse is inserted in its place; likewise when a system fails, it is removed from service and a new system is provisioned in it’s place. All high-performing IT organizations, not just the unicorns of IT, use this technique. This chapter focuses on how to achieve that goal.